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Answer Wiki. The ionic charge of oxygen is -2. You can tell because oxygen is in group number 6, so it has 6 valence electrons. Since it needs 2 more electrons to become neutral with a full outer shell of 8 electrons, its charge is -2 (since adding electrons gives a negative charge).
Although the total electrical charge on a water molecule is zero, the region of the molecule where the oxygen atom is located has a slight negative charge (2 Î´ -), while the regions of the molecule where each of the two hydrogen atoms are located each have a slight positive charge (Î´ +).